Hi aatakyi,
Welcome to the Forum! The Premise/Conclusion Indicator list is not exhaustive. One thing to remember is that you only need one. For example, "Because it is a raining, I will stay home" has the same premise and conclusion as "It is raining, so I will stay home." In the first example, the word "because" is a premise indicator. In the second example, the word "so" is a conclusion indicator. But sometimes there aren't easy indicators to underline like "therefore" and "due to." In that case, you need to think about the content. The premise answer "why?" and the conclusion answers "what is the author driving at?" For example, what if I said "It's raining. I should stay home." There, "staying home" is not WHY it's raining. So it can't be the premise. It doesn't make much sense to say "It's raining because I should stay home." However, it makes a lot of sense (to me, a homebody!) to say "I should stay home because it's raining."
Sometimes you'll see intermediate conclusions. That's when a premise leads to a conclusion, which then leads to another conclusion. How to tell the difference? You can use the same technique. To continue with this example: "I'm canceling our coffee date! It's raining, so I should stay home." There's two conclusions: "stay home" and "cancel coffee date." But think about which one helps EXPLAIN the other. Here, staying home helps explain WHY I'm canceling the date. Canceling the date does not help explain WHY I'm staying home (unless I'm embarrassed and really trying to avoid the person, but that's another matter!).
Hope that helps.